Parrot Palace works with TV and movie producers who need birds that can perform special tricks, such as playing dead, reciting poetry, ladder climbs, and various other tricks. Parrot Palace has about 50 birds and a list of 20 tricks from which to choose. Each bird can perform one or more tricks, and many tricks can be performed by more than one bird. When a bird learns a new trick, the trainer assigns a skill level. Some customers insist on using birds that score a 10, which is the highest skill level. As an IT consultant, you have been asked to suggest 3NF table designs. You are fairly certain that a M:N relationship exists between birds and tricks.